Metal–Organic Framework-Templated Synthesis of Bifunctional N-Doped TiO2–Carbon Nanotablets via Solid-State Thermolysis
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- 作者：Yifan Gu ; Kuan Cheng ; Yi-nan Wu ; Ying Wang ; Catherine Morlay ; Fengting Li
- 刊名：ACS Sustainable Chemistry & Engineering
- 出版年：2016
- 出版时间：December 5, 2016
- 年：2016
- 卷：4
- 期：12
- 页码：6744-6753
- 全文大小：638K
- ISSN：2168-0485
文摘
Porous nitrogen-doped TiO2–carbon hybrid nanotablets were prepared via one-step solid-state thermolysis of amino-functionalized titanium metal–organic framework NH2-MIL-125(Ti). Amorphous, anatase, rutile, or mixture phases of TiO2 were obtained controllably by manipulating pyrolysis temperature. The anionic N- in NH2-MIL-125(Ti)’s 3D structure formed as pyridinic nitrogen and pyrrolic nitrogen into the graphene layer. Meanwhile, a programmed evolution of the porous structure of the resultant composites, i.e., microporous, hierarchically micro/mesoporous, and mesoporous, was presented systematically. The morphology and specific nanoporous structure of the products are conferred by the metal–organic framework template. The resultant composites with hierarcical meso/miciroporous structures showed highly improved CO2 uptake ability compared with those of commercial P25 TiO2, g-C3N4, and 3D graphene. TiO2 nanoparticles are well dispersed in the porous nitrogen-doped carbon matrix, endowing the obtained composites with effective photocatalytic activity. The nitrogen-doped TiO2–carbon nanotablets with hierarchically micro/mesoporous structure and anatase/rutile heterostructure exhibited the best photocatalytic performance with excellent adsorption capacity toward organic dyes. Results also indicated that the optimized composite possessed excellent long-term stability and regeneration ability. Benefiting from their versatile pore structure, heteroatom doping, and semiconductor incorporation, the nitrogen-doped TiO2–carbon composites derived from metal–organic frameworks could find various potential applications, especially for sustainable chemistry and engineering.